JPH0774089B2 - Mortar composition - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar composition which can be used as a repairing material, a repairing material, lath mortar or the like to protect a steel material such as a skeleton or a lath mortar and to improve durability. . More specifically, the mortar composition of the present invention is prepared by adding a corrosive metal material to concrete or lightweight cellular concrete (AL
C) or lath mortar, etc., or by being used on the surface of an existing inorganic cured (molded) product or on a repaired part, the rust preventive agent or alkali metal salt in the aggregate will corrode over a long period of time. The present invention provides a mortar composition that prevents corrosion of a metal material and prevents deterioration of a cured inorganic material.

[0002]

2. Description of the Related Art An inorganic hardened material in which a corrosive metal material such as reinforced concrete is embedded, when rust occurs in the corrosive metal material due to intrusion of rainwater or the like, cracks may occur in the inorganic hardened material due to its volume expansion, It crushes. In particular,
When a high concentration of chlorine ions is mixed in the inorganic cured product, the corrosive metal material corrodes relatively easily. Conventionally, the following methods have been disclosed as methods for preventing the corrosive metal material in the above-mentioned cured inorganic material from rusting. JP-A-55-78764 discloses that
A method is described in which the surface of reinforced concrete or an inorganic material is coated and impregnated with a solution of a water-soluble silicate compound and then coated with a cement paste. JP-A-60-2
Japanese Patent No. 04683 describes a method of coating and impregnating the surface of an inorganic material containing a steel material with an aqueous solution of an inorganic salt having a rust preventive effect, and further, a method of overcoating with a cement composition. JP-A-60-231478 discloses a method in which the surface of an inorganic material containing a steel material is coated and impregnated with an aqueous solution of an inorganic salt having an anticorrosive effect, and then an aqueous solution of a water-soluble silicate is applied, and thereafter. , A method of overcoating a cementitious composition, and the like. Japanese Patent Laid-Open No. 62-74090 discloses a method in which the surface of an inorganic material containing a steel material is coated and impregnated with an aqueous solution of an inorganic salt having an anticorrosive effect, and then a silicon-based and / or silane-based primer is overcoated. Furthermore, after that, a method of overcoating with a paint is described. Tokkyo 1-35
Japanese Patent No. 788 describes a rust preventive mortar mixed with lithium silicate and a rust preventive paint. JP-A 1-2
Japanese Unexamined Patent Publication No. 01088 describes a method of coating and impregnating the surface of an inorganic material containing a metal material with an aqueous solution of an inorganic salt and / or a silicate compound, and then coating a treatment agent containing an organic titanate as a main component. ing. JP-A-57-20
In 1444, the glass transition point is 0 on the surface of the building.
A method for forming a coating film containing a synthetic resin at a temperature of 0 ° C. or lower is described. Japanese Patent Laid-Open No. 61-158880 discloses that
A method of applying rust preventive agent mainly composed of polyhydric alcohol nitroester to reinforced concrete, impregnating it, then applying aqueous solution of lithium silicate, and further applying silicon-based penetrating water repellent is described. . JP-A 1-29
Japanese Patent No. 8185 describes a method of coating and impregnating an aqueous solution of lithium silicate from the surface of concrete containing a steel material, and then impregnating an aqueous solution of calcium nitrite, and then a method of coating a cementitious composition. Has been done.

[0003]

However, among the above-mentioned rust-prevention methods (1) to (4),
Either or both of an aqueous solution of a rust preventive such as calcium nitrite and an aqueous solution of an alkali metal salt such as lithium silicate are applied (impregnated) to the surface of the inorganic material, respectively, or thereafter, a cementitious composition In such a method, the coating amount becomes non-uniform and the permeation amount also becomes non-uniform, so that the drug diffusion effect also becomes non-uniform and the rust-preventing effect with time deteriorates. . Further, since the number of processing steps is large, the construction process is complicated and the construction time also becomes long. Furthermore, since the repairing mortar composition has a low moisture permeability, when dew condensation water or the like is generated in the inorganic material, the moisture stays inside without being dissipated to the outside of the inorganic material, and the anticorrosive effect is also halved. In particular,,,
Is overcoated with a silicone-based and / or silane-based primer, a treatment agent containing an organic titanate as a main component, a silicon-based permeation-type water repellent, and a paint, so that the moisture inside the above-mentioned inorganic material does not easily diffuse to the outside. The anticorrosion effect remarkably decreases with time.

Further, the above-mentioned method is to impart a gas barrier property to the surface of a building by forming a synthetic resin coating film, which is inherent in the building, like the above-mentioned items 1 to 3. Moisture is hard to dissipate, so the rust prevention effect is not sufficient.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above, and has incorporated an aggregate in which a rust preventive agent is contained in a porous aggregate and the surface of which is coated with cement. The present invention relates to a mortar composition characterized by the above.

The above-mentioned porous aggregate used in the present invention is
Any material may be used as long as it has fine pores and has a water absorbing property, and the material and properties are not particularly limited. Therefore, not only the inorganic aggregate but also an organic foam aggregate such as ethylene-vinyl acetate foam aggregate may be used as the porous aggregate of the present invention. However, in particular, by using a porous aggregate having a particle size, an air-dry bulk density, and a water absorption rate as shown below, it is possible to improve the troweling workability of the inorganic cured product containing the porous aggregate, which is obtained. It is possible to reduce the water permeability of the inorganic cured (molded) product and improve the moisture permeability. That is, the particle size is 5 to 0.06 mm, more preferably 2.
It is sufficient to use one having a range of 5 to 0.1 mm. Also,
The air-dry bulk density may be 1.5 to 0.1. When it is 1.5 or more, the impregnating and adsorbing ability of the rust preventive agent becomes low, and the moisture permeability of the obtained inorganic cured product is lowered. On the other hand, if it is 0.1 or less, the strength of the obtained inorganic cured product decreases, and the water permeability and water absorption increase, which is not preferable. Further, the water absorption rate may be 500 to 15 wt%. When it is 500 wt% or more, the impregnating and adsorbing ability of the rust preventive agent and the alkali metal salt increases, but the strength of the obtained mortar decreases, and the water permeability and water absorption increase, which is not preferable. On the other hand, if it is 15 wt% or less, the impregnating and adsorbing ability of the rust preventive agent and the alkali metal salt becomes low, and the moisture permeability of the obtained inorganic cured product is lowered. As the above-mentioned porous aggregate having air-dry bulk specific gravity and water absorption, natural zeolite (mordenite, clinoptilolite, xM (2 / n) O.
_{Al 2 O 3 · ySiO 2 ·} zH crushed granules ₂ O), granulation, granulating pellets products, granulated granules, allophane (Allo
phane, natural silica-alumina gel, Al ₂ O ₃ · mSi
O ₂ · nH ₂ O + Al (OH) ₃ ) granules, granules,
Examples include diatomaceous earth granulated fired particles, tuff-based natural glass fired products, rhyolite-based natural glass pumice, calcium silicate crushed particles, foamed glass particles, refractory brick crushed particles, and ALC crushed particles.

The rust preventive used in the present invention is JIS
A 6205 “Rustproofing agent for reinforced concrete” may be used, and examples thereof include nitrites such as calcium nitrite and sodium nitrite, pyroxyethylene bisglycerol porate, and polyoxyethylene bisglycerol. Examples thereof include borate esters such as polate and oleate, and organic carboxylic acid salt-based compounds.

In order to incorporate the rust preventive agent as described above into the porous aggregate as described above, an aqueous solution of the rust preventive agent may be added to the porous aggregate and allowed to absorb water. The porous aggregate may be impregnated into the aqueous solution to absorb water sufficiently.

Then, the surface of the above-mentioned aggregate is coated with cement, which is hardened and granulated. As the above-mentioned cement, for example, Portland cement, Portland mixed cement, white cement, jet cement and the like can be used. In this way, after adding an aqueous solution of a rust preventive agent to the porous aggregate to absorb water, the cement is coated on the surface without drying, and the cement is cured so that the water content on the surface of the porous aggregate is increased. Harden with.

The aggregate thus obtained can be appropriately mixed with other commonly used aggregates to be blended in the mortar composition, and since the surface is coated with cement, it has excellent storage stability. , A storage method similar to that of other commonly used aggregates can be performed. Further, since the surface thereof is coated with cement, the contained rust preventive agent is gradually dissolved in small amounts, and the mortar composition containing the rust preventive agent can be rustproofed for a long period of time. Incidentally, the mortar composition of the present invention can be blended as various inorganic cured products depending on the use, for example, concrete, lightweight concrete,
It can be appropriately mixed and used as a precast concrete member, an ALC panel, a cement mortar or the like. Further, by applying the mortar composition of the present invention to the surface or a repaired portion of an existing inorganic cured (molded) product, the rust preventive agent penetrates into the existing inorganic cured (molded) product to prevent rust. can do. Therefore, by using the mortar composition of the present invention as an inorganic hardened (molded) product or on the surface or a refurbished portion of an existing inorganic hardened (molded) product, the aggregate can be used for a long period of time. The rust preventive agent inside rusts the corrosive metal material, and can prevent deterioration of the inorganic hardened material.

In the present invention, instead of the above-mentioned rust preventive agent, an aggregate containing an alkali metal salt such as lithium silicate or lithium nitrite may be blended. The aggregate in which the alkali metal salt is incorporated in the porous aggregate can be prepared by adding an aqueous solution of the alkali metal salt to the porous aggregate to absorb water, and then drying and evaporating the water content. it can. Alternatively, an aqueous solution of an alkali metal salt may be added to the porous aggregate to absorb water, and then the surface of the aggregate may be coated with cement without being dried to be hardened and granulated.

When an aggregate containing such an alkali metal salt is mixed into a mortar composition and cured, the alkali metal salt gradually dissolves in minute amounts, and an inorganic cured (molded) product is formed over a long period of time. Can be made alkaline and rustproof. Further, when the mortar composition containing the aggregate containing the alkali metal salt is applied to the surface or the repaired part of the existing inorganic cured (molded), the inside of the existing inorganic cured (molded) is Since the alkali metal salt diffuses and permeates up to 1, the neutralization rate can be delayed.
Therefore, by using the mortar composition of the present invention as an inorganic hardened (molded) product or on the surface or a repaired part of an existing inorganic hardened (molded) product, the aggregate can be used for a long period of time. The alkali metal salt therein prevents the corrosive metal material from rusting and can prevent deterioration of the inorganic cured material.

Further, by using together the aggregate containing the rust preventive of the present invention and the aggregate containing an alkali metal salt, it is possible to prevent deterioration of the inorganic cured product for a longer period of time. You can

[0014]

EXAMPLES Examples of the present invention will be shown below. First, the aggregates A to K were manufactured as follows. The porous aggregate used was as shown in Table 1 below.

[0015]

[Table 1]

Aggregate A: 120 cc of tap water and Sabinone P
(Rust preventive, manufactured by Kirest Chemical Co., Ltd.) 6.9 g was added,
Stir well to dissolve. Next, zeolite 1014
(Porous aggregate) 58 g, Zeolite 1424 (porous aggregate) 229 g were added and sufficiently stirred to absorb water.
Put in a dryer at 0 ° C to dry.

Aggregate B: Sabinone P in 120 cc of tap water
(Rust preventive agent) 13.8 g is added and sufficiently stirred to dissolve. Next, 58 g of zeolite 1014 (porous aggregate),
After 229 g of zeolite 1424 (porous aggregate) is added and sufficiently stirred to absorb water, it is placed in a dryer at 50 ° C. and dried.

Aggregate C: Sabinone P in 120 cc of tap water
(Rust-preventing agent) 6.9 g is added and sufficiently stirred to dissolve. Next, 58 g of zeolite 1014 (porous aggregate),
After 229 g of zeolite 1424 (porous aggregate) is added and sufficiently stirred to absorb water, 140 g of ordinary Portland cement is added and stirred to carry out adhesion granulation. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate D; Sabinone P in 120 cc of tap water
(Rust preventive agent) 13.8 g is added and sufficiently stirred to dissolve. Next, 58 g of zeolite 1014 (porous aggregate),
After 229 g of zeolite 1424 (porous aggregate) is added and sufficiently stirred to absorb water, 140 g of ordinary Portland cement is added and stirred to carry out adhesion granulation. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate E; Sabinone P in 200 cc of tap water
(Rust-preventing agent) 6.9 g is added and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2
g, Isolite No. 2 (porous aggregate) 168 g are added and sufficiently stirred to absorb water, and then 200 g of ordinary Portland cement is added and stirred to adhere and granulate. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate F: Sabinone P in 200 cc of tap water
(Rust preventive agent) 13.8 g is added and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2
g, Isolite No. 2 (porous aggregate) 168 g are added and sufficiently stirred to absorb water, and then 200 g of ordinary Portland cement is added and stirred to adhere and granulate. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate G: Sabinone P in 200 cc of tap water
(Rust preventive agent) 20.7 g is added and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2
g, Isolite No. 2 (porous aggregate) 168 g are added and sufficiently stirred to absorb water, and then 200 g of ordinary Portland cement is added and stirred to adhere and granulate. 20 this
After curing at 65 ° C. for 48 hours, put it in a dryer at 50 ° C. to dry.

Aggregate H; LINI-2 in 100 cc of tap water
5 (lithium nitrite aqueous solution, manufactured by Nissan Chemical Industries, Ltd.)
Add 110 g and stir well to dissolve. Next, 188.2 g of Isolite No. 1 (porous aggregate) and 168 g of Isolite No. 2 (porous aggregate) were added and sufficiently stirred to absorb water, and then placed in a dryer at 50 ° C. to be dried.

Aggregate I; LINI-2 in 100 cc of tap water
110 g of 5 (lithium nitrite aqueous solution) is added and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2 g, Isolite No. 2 (porous aggregate) 16
After adding 8 g and stirring sufficiently to absorb water, 200 g of ordinary Portland cement is added and stirred to adhere and granulate. After curing it at 20 ℃ and 65% for 48 hours,
Put in a dryer at ℃ to dry.

Aggregate J; ZOL-51 in 100 cc of tap water
0 (lithium silicate aqueous solution, manufactured by Nissan Chemical Industries, Ltd.)
Add 110 g and stir well to dissolve. Next, 188.2 g of Isolite No. 1 (porous aggregate) and 168 g of Isolite No. 2 (porous aggregate) were added and sufficiently stirred to absorb water, and then placed in a dryer at 50 ° C. to be dried.

Aggregate K; ZOL-51 in 100 cc of tap water
0 g (lithium silicate aqueous solution) of 110 g is added and sufficiently stirred to dissolve. Next, Isolite No. 1 (porous aggregate) 188.2 g, Isolite No. 2 (porous aggregate) 16
After adding 8 g and stirring sufficiently to absorb water, 200 g of ordinary Portland cement is added and stirred to adhere and granulate. After curing it at 20 ℃ and 65% for 48 hours,
Put in a dryer at ℃ to dry.

Examples 1 to 12 Using the above-mentioned aggregates A to K, the mortar compositions for repair / repair having the blending compositions shown in Tables 2 and 3 were mixed and adjusted. In addition, Examples 1 and 2 are reference examples.

Comparative Examples 1 to 5 The repairing / repairing mortar compositions having the blending compositions shown in Tables 2 and 3 were mixed and adjusted without using the aggregates A to K.

[0029]

[Table 2]

[0030]

[Table 3]

Specimen 1; The mortar compositions for repair / repair of Examples 1 to 12 and Comparative Examples 1 to 5 described above were kneaded with the amounts of water shown in Tables 2 and 3 in accordance with the Japan Architectural Institute Standard JASS 15M-102. And put it in a 4x4x16 cm formwork,
Mold. After subjecting this to moisture-air curing at a temperature of 20 ° C. and a humidity of 80% or more for 48 hours, it was demolded and cured in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 65% for up to 2 weeks to obtain a test sample 1.

Specimen 2; Specimen 2 was prepared under the same conditions as Specimen 1 described above except that it was molded into 7 × 7 × 2 cm.

Specimen 3; The cement-based composition was overcoated on the front and back surfaces (7 × 7 cm) of Specimen 2 described above, and cured in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 65% for up to 2 weeks. And designated as Specimen 3. Two days before the completion of curing, epoxy resin paint was applied to the side surface to seal it. In addition, the above-mentioned cement composition was made into a paste form with 25 kg of Fujilite # 10 (manufactured by Fujikawa Kenzai Kogyo Co., Ltd.), 2.5 kg of a polymer dispersion for acrylic cement admixture (solid content 60%), and water. The kneaded one was used.

Specimen 4; Specimen 4 was prepared under the same conditions as those of Specimen 3 described above except that the cement composition containing the rust preventive was overcoated. The cement composition containing the rust preventive agent is 25 kg of Fujilite # 10 (manufactured by Fujikawa Construction Materials Co., Ltd.) and 250 g of SAVINON P (rust preventive agent).
Then, 2.5 kg of a polymer dispersion for admixing acrylic cement (solid content 60%) and water were kneaded in a paste form.

Test 1; Rust generation test After the weight of the cured specimen was measured, the temperature was 50.
It was placed in a Franki machine that was kept at ℃ and humidity of 90% or more, and the state of rust was observed. No rust is generated ◎ Little rust is generated ■ Little rust is observed △ △ Rust is significantly observed × Rust is significantly observed It was judged as XX (n = 3), and the results are shown in Tables 4 to 6. As a comparative condition, the specimen was placed in a polystyrene hermetic container, and the rust generation state was similarly observed in a constant temperature and humidity chamber at 20 ° C. and 65%.

Test 2; Measurement of Moisture Absorption Weight In Test 1 described above, the change in weight (g) of the test piece was measured (n = 3) while observing the occurrence of rust, and the results are shown in Tables 4 to 6. .

Test 3; Measurement of flexural strength After completion of each of the tests 1 and 2, the flexural strength (kg
/ Cm ² ) was measured (n = 3), and the results are shown in Tables 4-5. Testing machine: Shimadzu autograph AG5000C crosshead speed 0.5mm / min

Test 4; Measurement of Area of Neutralized Portion After completion of each of the above-mentioned Tests 1, 2 and 3, a 1% solution of phenolphthalein was sprayed on the fractured cross section to measure the area ratio of the neutralized portion. (%) Was measured (n = 3), and the results are shown in Table 4 to
5 shows.

[0039]

[Table 4]

[0040]

[Table 5]

[0041]

[Table 6]

[0042]

As described above, in the mortar composition of the present invention, the rust preventive agent is incorporated in the fine pores of the porous aggregate, and the surface of the aggregate is coated with cement. In an inorganic cured (molded) product obtained by curing this, an extremely small amount of an anticorrosive agent is gradually dissolved to exhibit an anticorrosive effect for a long period of time. Moreover, when the mortar composition of the present invention is applied to the surface or the repaired portion of an existing inorganic cured (molded) product, the rust preventive agent diffuses and penetrates into the interior thereof, so that the rust preventive composition is used over a long period of time. It is possible to prevent deterioration of an existing inorganic cured (molded) product, that is, the mortar composition of the present invention is simply compared to a mortar composition in which a rust inhibitor and an alkali metal salt are mixed.
It is possible to prevent deterioration of the inorganic cured product over an extremely long period of time.

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Claims (3)

[Claims] 1. A mortar composition comprising an aggregate in which a rust preventive agent is incorporated in a porous aggregate and the surface of which is coated with cement. 2. An aggregate in which a rust preventive agent is contained in a porous aggregate and the surface of which is coated with cement, and an aggregate in which an alkali metal salt is incorporated in the porous aggregate. A mortar composition characterized by being blended. 3. An aggregate in which a rust preventive agent is incorporated in a porous aggregate and the surface of which is coated with cement, and an alkali metal salt is incorporated in the porous aggregate, and the surface of which is cement. A mortar composition characterized by being mixed with an aggregate coated with.